Substrate for an electronic circuit



FIG. 1 is a front, bottom and right side perspective view of a substrate for an electronic circuit, showing our new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is bottom view thereof;

FIG. 7 is a right side view thereof, the left side being symmetrical;

FIG. 8 is a cross sectional view thereof, taken along line 8-8 in FIG. 3; and,

FIG. 9 is a cross sectional view thereof, taken along line 9-9 in FIG. 3.

The broken line portion of the figure drawings is included to show portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a substrate for an electronic circuit, as shown and described. 